feat(election): election duration blocking, director tenure auto-fill, audit logging, and scheduler

- Add durationYears to ElectionConfig with Liquibase migration (0348)
- Block new election creation when previous election duration is still active (PostgreSQL-compatible native query)
- Auto-override director tenureEndDate from election durationEndDate on appoint and update
- Add ElectionSchedulerConfiguration to enable @Scheduled support
- Fix JPQL EclipseLink enum compatibility in expireByTenureDate query
- Add full audit logging to DirectorAppointmentServiceImpl (appoint, update, remove, auto-expire)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

fineract-provider/src/main/resources/db/changelog/tenant/changelog-tenant.xml

@@ -375,4 +375,5 @@
     <include file="parts/0345_election_candidate_manual_vote_count_drop_default.xml" relativeToChangelogFile="true"/>
     <include file="parts/0346_election_audit_log_description_to_text.xml" relativeToChangelogFile="true"/>
     <include file="parts/0347_election_director_appointment.xml" relativeToChangelogFile="true"/>
+    <include file="parts/0348_election_config_duration_years.xml" relativeToChangelogFile="true"/>
 </databaseChangeLog>

fineract-provider/src/main/resources/db/changelog/tenant/parts/0348_election_config_duration_years.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<databaseChangeLog
+    xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
+        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-4.6.xsd">
+
+    <changeSet id="0348-add-duration-years-to-election-config" author="lincpay">
+        <addColumn tableName="m_election_config">
+            <column name="duration_years" type="INT">
+                <constraints nullable="true"/>
+            </column>
+        </addColumn>
+    </changeSet>
+
+</databaseChangeLog>